Airtac SCJ50 Standard Cylinder SCJ50X75-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X75-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke75 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X75-20S
The SCJ50X75-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing a nominal 75 mm stroke that can be shortened by up to 20 mm via the rear-cap screw. This 50 mm bore unit delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a solid mid-range actuator for tasks requiring fine positional tuning during commissioning or changeovers.
Equipped with a built-in magnet, this model accepts CMSG/DMSG/EMSG sensors for direct barrel-mounted position feedback without extra brackets. It uses a 20 mm piston rod, PT1/4 ports, and an M16x1.5 rod thread, with a 21 mm air cushion and a body length of 194 mm. The standard TPU seal suits ambient temperatures from -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X75-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X75-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X75-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -20 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ50 Standard Cylinder SCJ50X75-20S Is Used
Commissioning & Setup
Technicians can fine-tune the 20 mm stroke-end adjustment on the fly to perfect the actuator's stopping position during initial machine setup, eliminating the need for shims or trial-and-error cylinder swaps.
Format Changeovers
Ideal for packaging lines where the push stroke must be quickly altered for different product sizes. The rear screw adjustment allows operators to set a new end position in seconds.
Wear Compensation
In clamping or pressing applications, the adjustable stroke can be used to take up mechanical wear in tooling or workpieces over time, maintaining consistent contact force without reprogramming.
Is the Airtac SCJ50 Standard Cylinder SCJ50X75-20S the Right Cylinder?
With 982 N of push force at 0.5 MPa, this 50 mm bore cylinder is a step up from the 40 mm SCJ (628 N) and a step below the 63 mm (1559 N). Choose the SCJ over a fixed-stroke SC when you need to dial in the stroke end on the machine without swapping cylinders or adding external hard stops. For a direct replacement, match the 50 mm bore, 75 mm nominal stroke, 20 mm adjust range, PT ports, basic mounting, and the -S magnet option of this model.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X75-20S FAQ
At the standard 0.5 MPa operating pressure, it provides 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The force is identical to a fixed-stroke SC50 cylinder of the same bore.
A rear-cap screw lets you shorten the stroke end by up to 20 mm from the 75 mm nominal maximum. It is a direct dimensional and functional replacement for another AirTAC SCJ50X75-20S, but it is longer than a fixed-stroke SC50 and cannot be swapped into the same space without checking the 194 mm body length.
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